3 3⁄8" tachometer & tach/hour meter - Selector switch for 4, 6 and 8 cylinder and outboards. - Tachometers come set for use with an 8 cylinder. You may need to adjust selector switch to match your application - 4 or 6 cylinder or outboard. - 12-volt red-orange light and mounting bracket. - Matching flourescent, UV protected pointers. - Bolder fonts on every gauge provide a consistent appearance. - Completely waterproof with new anti-fog lens that eliminate the possibility of water damage and fogging. - Order custom gauge rims and decorative bezels in a variety of UV protected, metallic powder coated colors to compliment your boat’s interior. - 3 3/8" Cutout